Trying to use the basic design of a Model A for anything other than the body is a lost cause. The cheaper alternative would be to try to buy a car with the basic rebuilding done. If that doesn't fit the bufget... or you want to build it yourself... proceed.
No builder has all of the skills... so you may need some help.
These early cars are so primitive mechanically that most will update all of the basics, like the driveline... suspension... steering... electrical. etc.
The first thing I would look for is a fabricator who can help swap out the major mechanicals.
Many people who work in the hobby may not be "fun" to work with. Ask older rodders. They have had time to sort out the guys who are reliable.
Don't plan on a quick build. That just won't happen. Plan on an effort of a few years.
Most importantly.... Have fun with it!